Malicious PDF — malware analysis report

Static analysis result for SHA-256 778842c606df3f1e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 03:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaa3ed967468cd00fffb6393cff56526 SHA-1: 6ff0ee83b300398a706cee781a9b63f57b76119d SHA-256: 778842c606df3f1e971c36237f8da4388ca2b45f99bdba15d27432e282470921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links are likely used to host or redirect to malicious content, such as phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpvdt1spdchjibvmcb8dnh08i0/42079402897.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0f3b598e---xeriwusiteforawip.pdf
    • https://aulacvn.com/upload/fck/file/towasopikedunamagoguw.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ab4ae6c2a---migavixoralovowe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf0810008---rubibidelo.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb34232ccc---detakilolumetus.pdf
    • https://gulyaskantin.hu/uploads/frontend/files/49204130386.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/05jusv5kiaen9g8at9oagsfpom/72666205585.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df84ec22d45---66176486202.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607904041e828---zoweligemonugosumor.pdf
    • http://tahi.hu/ckfinder/userfiles/files/puvekepi.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbad49b241---luzezizabezugopamo.pdf
    • http://i-daa-wl.de/userfiles/parubefaniru.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2325633df3---fivutitibew.pdf
    • http://tyextractor.com/d/files/57186040503.pdf
    • http://kanalprofi.at/UserFiles/file/vumagifuxo.pdf
    • http://leebyunghun.kr/new/upload/board/files/33250058467.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a8af1bb417a95293496cc621fecdb3c0/57964953.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f957ea968---65086476456.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0732d659c3---41901273518.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a8997f8670775701be5cb2bae43ec1ea/nezobif.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7dbdafeb1c2420798ddcaae99c3264ef/walebesuxubope.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=degree+minute+and+second+calculator
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6a.bin
bca435d866ffc4ea2a2c723812a561d6c2bb8bb57e1862e198ba9275860a9736
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 10812 bytes
font_01_sfnt_off0001031d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 16792 bytes
font_02_sfnt_off00011b2f.bin
eb2f8c618b3227504041369526c3284b504e9efaf2d38264cbbb15428b8435bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 17344 bytes